k =['sad','sdsd','sd',['sdsd','sdsd','dgdg']]
s = [['今天','是','五月','六号']]
sublist = s[0]
print(sublist.index('六号'))
k.insert(1,"你好")
k.append("困死了")
k.extend(s)
index = k.index('sd')
el = k.remove("sd")
count = k.count('sd')
print(count)